Afficher la notice abrégée

Influence of Seasonal River Discharge on Tidal Propagation in the Ganges‐Brahmaputra‐Meghna Delta, Bangladesh

dc.rights.licenseopenen_US
hal.structure.identifierUniversity of New South Wales [Canberra Campus] [UNSW]
dc.contributor.authorELAHI, M.
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
hal.structure.identifierUniversity of New South Wales [Canberra Campus] [UNSW]
dc.contributor.authorJALON ROJAS, Isabel
ORCID: 0000-0003-4254-4084
IDREF: 160580730
hal.structure.identifierUniversity of New South Wales [Canberra Campus] [UNSW]
dc.contributor.authorWANG, X.
hal.structure.identifierUniversity of New South Wales [Canberra Campus] [UNSW]
dc.contributor.authorRITCHIE, E.
dc.date.accessioned2024-03-27T10:10:58Z
dc.date.available2024-03-27T10:10:58Z
dc.date.issued2020-10-12
dc.identifier.issn2169-9275en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/189006
dc.description.abstractEnSignificant research efforts have been devoted to understanding river-tide interactions in estuaries. However, studies on the impact of monsoon-driven fluctuations of river discharge are limited. Here, the role of varying river discharge on the tidal propagation and tidal limit along the Ganges-Brahmaputra-Meghna Delta (GBMD), a macrotidal estuary subject to seasonal and annual river discharge variations, is investigated. The Delft3D hydrodynamic model is validated and applied to an average flood year condition and nine idealized scenarios covering the typical hydrological conditions. Results reveal that the upper limit of the tidal propagation shifts 75 km upstream during the dry season. The residual water level slope and tidal damping rate increase with river discharge beyond 100 km from the estuary mouth. The balance between the generation and dissipation of quarterdiurnal tides shifts spatially as a result of changes in channel convergence and friction and temporally as a function of river discharge, which controls the total friction in the upper tidal river. The balance between tidal dissipation and generation depends on the residual velocity generated by river discharge and the velocity of the principal tides. The maximal generation of quarterdiurnal tides in the upper GBMD depends on the friction generated from the river-tide interaction. Critical river discharge thresholds produce an optimal condition of dissipation of semidiurnal tides and generation of quarterdiurnal tides through friction at the upper and middle estuary. River discharge above the critical river discharge amount more rapidly dissipates both semidiurnal and quarterdiurnal tides than generates quarterdiurnal tides from nonlinear interactions.
dc.language.isoENen_US
dc.title.enInfluence of Seasonal River Discharge on Tidal Propagation in the Ganges‐Brahmaputra‐Meghna Delta, Bangladesh
dc.typeArticle de revueen_US
dc.identifier.doi10.1029/2020JC016417en_US
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnementen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
bordeaux.journalJournal of Geophysical Research. Oceansen_US
bordeaux.pagee2020JC016417en_US
bordeaux.volume125en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue11en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamMETHYSen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-03438903
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Geophysical%20Research.%20Oceans&rft.date=2020-10-12&rft.volume=125&rft.issue=11&rft.spage=e2020JC016417&rft.epage=e2020JC016417&rft.eissn=2169-9275&rft.issn=2169-9275&rft.au=ELAHI,%20M.&JALON%20ROJAS,%20Isabel&WANG,%20X.&RITCHIE,%20E.&rft.genre=article


Fichier(s) constituant ce document

Thumbnail
Nom:
2020JC016417 (2).pdf
Taille:
2.714Mo
Format:
PDF
Voir/Ouvrir

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée